CO Regulation

Question 1

Stroke Work Formula

Answer 1

SW= SV-MAP

Question 2

On a Frank Starling graph, how do you measure contractibility?

Answer 2

The tangential slope

Question 3

If you shut off Sympathetic function will you see a big change in the heart activity? Why or why not?

Answer 3

Nah, b/c PS is the main regulator via SA node

Question 4

Why can’t you increase CO after hr of 100?

Answer 4

Not enough time to fill the heart

Question 5

Baroreceptor reflex

Answer 5

High bp sends aff. signal to med. CV center (-) Symp (+) para. HR and SV go down

Question 6

Bainbridge reflex

Answer 6

Sudden blood vol. increase in healthy person +HR

Low Pressure Atrial Receptors

Question 7

Chemoreceptor Reflex

Answer 7

low o2, high co2, funky pH=Bradycardia and ^Resp

Stop pumping bad blood; breathe to detox

Question 8

Frank-Starling Mechanism

Answer 8

Higher preload increases SV (Optimal Sarcomere length) without affecting Contractility.
- Driven by sys-dia pressure gradient

Question 9

Trepp-Staircase Effect

Answer 9

-Increase cellular calcium is responsible for contraction